What are the causes of major social problems?

This is really a big question... I would say some of the reasons for social problems are:
 -wealth inequality
-discrimination of some sort, social, racial, gender, class

-poverty
-lack of education
-easy avaliability of hard drugs

Ongoing civil wars western roman empire finally collapsed476 c.e. romulus, the last of theroman  emperors in  the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the  roman empire  had brought towestern  europe for 1000 years was no more.